Note 12 - Stock Warrants
|6 Months Ended|
Jun. 30, 2023
|Notes to Financial Statements|
|Stock Warrants Disclosure [Text Block]||
As of June 30, 2023, there are 23,348,906 warrants outstanding to purchase Navidea's Common Stock. The warrants are exercisable at prices ranging from $0.16 to $0.94 per share with a weighted average exercise price of $0.17 per share. The warrants have remaining outstanding terms ranging from 1.0 to 4.2 years.